jfs: turn diLog(), dataLog() and txLog() into void functions

These functions always return '0' and no callers use the return value.
So make it a void function.

This eliminates the following coccicheck warning:
./fs/jfs/jfs_txnmgr.c:1365:5-7: Unneeded variable: "rc". Return "0" on
line 1414
./fs/jfs/jfs_txnmgr.c:1422:5-7: Unneeded variable: "rc". Return "0" on
line 1527
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

fs/jfs/jfs_txnmgr.c

@@ -148,10 +148,10 @@ static struct {
 /*
  * forward references
  */
-static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
-		struct tlock * tlck, struct commit * cd);
-static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
-		struct tlock * tlck);
+static void diLog(struct jfs_log *log, struct tblock *tblk, struct lrd *lrd,
+		struct tlock *tlck, struct commit *cd);
+static void dataLog(struct jfs_log *log, struct tblock *tblk, struct lrd *lrd,
+		struct tlock *tlck);
 static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 		struct tlock * tlck);
 static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
@@ -159,8 +159,8 @@ static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 static void txAllocPMap(struct inode *ip, struct maplock * maplock,
 		struct tblock * tblk);
 static void txForce(struct tblock * tblk);
-static int txLog(struct jfs_log * log, struct tblock * tblk,
-		struct commit * cd);
+static void txLog(struct jfs_log *log, struct tblock *tblk,
+		struct commit *cd);
 static void txUpdateMap(struct tblock * tblk);
 static void txRelease(struct tblock * tblk);
 static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
@@ -1256,8 +1256,7 @@ int txCommit(tid_t tid,		/* transaction identifier */
 	 *
 	 * txUpdateMap() resets XAD_NEW in XAD.
 	 */
-	if ((rc = txLog(log, tblk, &cd)))
-		goto TheEnd;
+	txLog(log, tblk, &cd);
 
 	/*
 	 * Ensure that inode isn't reused before
@@ -1365,9 +1364,8 @@ int txCommit(tid_t tid,		/* transaction identifier */
  *
  * RETURN :
  */
-static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd)
+static void txLog(struct jfs_log *log, struct tblock *tblk, struct commit *cd)
 {
-	int rc = 0;
 	struct inode *ip;
 	lid_t lid;
 	struct tlock *tlck;
@@ -1414,7 +1412,7 @@ static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd)
 		}
 	}
 
-	return rc;
+	return;
 }
 
 /*
@@ -1422,10 +1420,9 @@ static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd)
  *
  * function:	log inode tlock and format maplock to update bmap;
  */
-static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
-		 struct tlock * tlck, struct commit * cd)
+static void diLog(struct jfs_log *log, struct tblock *tblk, struct lrd *lrd,
+		 struct tlock *tlck, struct commit *cd)
 {
-	int rc = 0;
 	struct metapage *mp;
 	pxd_t *pxd;
 	struct pxd_lock *pxdlock;
@@ -1527,7 +1524,7 @@ static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 	}
 #endif				/* _JFS_WIP */
 
-	return rc;
+	return;
 }
 
 /*
@@ -1535,8 +1532,8 @@ static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
  *
  * function:	log data tlock
  */
-static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
-	    struct tlock * tlck)
+static void dataLog(struct jfs_log *log, struct tblock *tblk, struct lrd *lrd,
+	    struct tlock *tlck)
 {
 	struct metapage *mp;
 	pxd_t *pxd;
@@ -1562,7 +1559,7 @@ static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 		metapage_homeok(mp);
 		discard_metapage(mp);
 		tlck->mp = NULL;
-		return 0;
+		return;
 	}
 
 	PXDaddress(pxd, mp->index);
@@ -1573,7 +1570,7 @@ static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 	/* mark page as homeward bound */
 	tlck->flag |= tlckWRITEPAGE;
 
-	return 0;
+	return;
 }
 
 /*